9B-27.000MEEJ-B Crystal Equivalent & Substitute Parts

Part Overview

The 9B-27.000MEEJ-B is a 27 MHz through-hole crystal oscillator manufactured by TXC CORPORATION. This component operates at a fundamental frequency with an 18pF load capacitance and 30 Ohms equivalent series resistance in an HC-49/US package. The part is classified as obsolete, making identification of functionally equivalent substitutes necessary for ongoing system support, maintenance, and component procurement.

Substiute Parts

9B-27.000MEEJ-B

TXC CORPORATIONIn Stock: 7609B-27.000MEEJ-B Datasheet

Current PartRFQ

9B-27.000MAAJ-B

TXC CORPORATIONIn Stock: 79839B-27.000MAAJ-B Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 9B-27.000MEEJ-B crystal is determined by the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 27.0000 MHz (exact match required)
• Load Capacitance: 18 pF (exact match required)
• ESR: 30 Ohms (exact match required)
• Package / Case: HC-49/US (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Mode: Fundamental (exact match required)

Allowable Variation Parameters:

• Frequency Stability: The main part specifies ±10 ppm. Substitute parts with equal or tighter frequency stability (lower ppm value) are functionally equivalent. Substitute parts with relaxed frequency stability (higher ppm value) may be used in applications where the tighter tolerance is not required.
• Operating Temperature Range: The main part operates from -20°C to 70°C. Substitute parts with equal or wider temperature ranges are compatible.

The 9B-27.000MAAJ-B meets all mandatory matching parameters and is identified as a direct substitute. The primary difference is frequency stability specification: the substitute part is rated at ±30 ppm compared to the main part's ±10 ppm specification.

Parameter Comparison

Engineering Selection Recommendations

Substitution Criteria:

The 9B-27.000MAAJ-B is a direct functional substitute for the 9B-27.000MEEJ-B based on identical mechanical, electrical, and compliance specifications. Both parts are manufactured by TXC CORPORATION, share the same HC-49/US package footprint, and are ROHS3 compliant with REACH affected status.

Frequency Stability Consideration:

The substitute part carries a relaxed frequency stability specification of ±30 ppm versus the main part's ±10 ppm. Selection between these parts depends on the application's frequency tolerance requirements. Applications requiring ±10 ppm stability must use the 9B-27.000MEEJ-B. Applications with tolerance requirements of ±30 ppm or greater can use the 9B-27.000MAAJ-B.

Obsolescence Status:

Both parts are classified as obsolete. Component selection should prioritize availability and procurement lead times. The 9B-27.000MAAJ-B currently shows higher inventory availability (7882 pieces) compared to the 9B-27.000MEEJ-B (731 pieces), which may influence procurement decisions for long-term system support.

Compliance and Regulatory:

Both parts maintain identical RoHS3 compliance and REACH affected status, ensuring regulatory compatibility in applications subject to these standards.

Frequently Asked Questions (FAQ)

Q: Can the 9B-27.000MAAJ-B replace the 9B-27.000MEEJ-B in all applications?

A: The 9B-27.000MAAJ-B is mechanically and electrically compatible with the 9B-27.000MEEJ-B in applications where frequency stability of ±30 ppm is acceptable. Applications requiring the tighter ±10 ppm stability of the main part cannot use the substitute without circuit redesign or compensation.

Q: What is the physical compatibility between these two crystals?

A: Both crystals use the HC-49/US package with identical dimensions (11.50mm L x 5.00mm W) and maximum seated height (3.68mm). They are pin-compatible through-hole components suitable for direct PCB footprint replacement.

Q: Are there any compliance differences between the main part and substitute?

A: No. Both parts are ROHS3 compliant and REACH affected. They carry identical regulatory status and can be used interchangeably in applications subject to these standards.

Q: What determines whether I should use the ±10 ppm or ±30 ppm crystal?

A: The application's frequency tolerance requirement determines the appropriate part selection. Circuits requiring precise frequency control (such as communication systems, test equipment, or frequency-critical timing applications) typically require the ±10 ppm specification. General-purpose applications with relaxed frequency tolerance can use the ±30 ppm part.

Q: Why is the substitute part showing higher inventory availability?

A: The 9B-27.000MAAJ-B (7882 pieces) has significantly higher stock than the 9B-27.000MEEJ-B (731 pieces). This inventory difference may reflect market demand patterns or manufacturing production schedules. For procurement planning, the higher availability of the substitute part may provide supply chain advantages.

Q: Are these parts interchangeable on the PCB without any modifications?

A: Yes. Both parts share identical package specifications, pin configurations, and through-hole mounting requirements. No PCB modifications are required for physical substitution. However, circuit performance differences due to frequency stability variation must be evaluated for the specific application.